PFF5-5452 Engine Mount Insert  is  a two-piece kit made using our Red  65A durometer material,  designed to fill the voiding of the OE rubber mount to limit drivetrain movement and sharpen throttle response on standard or mildly tuned vehicles. Mount rigidity is increased by 100%. A small increase in  NVH, usually at idle, should be expected when stiffening the connecting mount between the engine/transmission and chassis. The harder the material used, the greater the NVH transmitted. Fits 3.0ltr B58 engines only.